private void button1_Click(object sender, EventArgs e)
        {
            IntPtr hwnd = FindWindow(textBox_classname.Text, null); //查找句柄

            if (hwnd != IntPtr.Zero)
            {
                ShowWindow(hwnd, 9);//显示窗体
                SetForegroundWindow(hwnd);    //将程序设为当前活动窗口

                SendKeys.Send("{F1}");
              //  System.Threading.Thread.Sleep(5000); 
              //  MessageBox.Show("1", "提示", MessageBoxButtons.OK);
            }
            else
            {
                MessageBox.Show("没有启动 [MX3]","提示",MessageBoxButtons.OK,MessageBoxIcon.Error);
            }
        }